/*******************************************************************************
 * Copyright (c) 2000, 2013 IBM Corporation and others.
 * All rights reserved. This program and the accompanying materials
 * are made available under the terms of the Eclipse Public License v1.0
 * which accompanies this distribution, and is available at
 * http://www.eclipse.org/legal/epl-v10.html
 *
 * Contributors:
 *     IBM Corporation - initial API and implementation
 *     Leon J. Breedt - Added multiple folder creation support (in WizardNewFolderMainPage)
 * 
 *******************************************************************************/
package org.eclipse.ui.dialogs;

import java.lang.reflect.InvocationTargetException;
import java.net.URI;
import java.util.Iterator;

import org.eclipse.core.commands.ExecutionException;
import org.eclipse.core.commands.operations.AbstractOperation;
import org.eclipse.core.filesystem.EFS;
import org.eclipse.core.filesystem.IFileStore;
import org.eclipse.core.filesystem.URIUtil;
import org.eclipse.core.resources.IContainer;
import org.eclipse.core.resources.IFolder;
import org.eclipse.core.resources.IResource;
import org.eclipse.core.resources.IResourceStatus;
import org.eclipse.core.resources.IWorkspace;
import org.eclipse.core.resources.IWorkspaceRoot;
import org.eclipse.core.resources.ResourcesPlugin;
import org.eclipse.core.runtime.CoreException;
import org.eclipse.core.runtime.IAdaptable;
import org.eclipse.core.runtime.IPath;
import org.eclipse.core.runtime.IProgressMonitor;
import org.eclipse.core.runtime.IStatus;
import org.eclipse.core.runtime.NullProgressMonitor;
import org.eclipse.core.runtime.OperationCanceledException;
import org.eclipse.core.runtime.Path;
import org.eclipse.core.runtime.Preferences;
import org.eclipse.core.runtime.SubProgressMonitor;
import org.eclipse.jface.dialogs.ErrorDialog;
import org.eclipse.jface.dialogs.IDialogConstants;
import org.eclipse.jface.dialogs.IMessageProvider;
import org.eclipse.jface.dialogs.MessageDialog;
import org.eclipse.jface.operation.IRunnableWithProgress;
import org.eclipse.jface.resource.CompositeImageDescriptor;
import org.eclipse.jface.resource.ImageDescriptor;
import org.eclipse.jface.viewers.IStructuredSelection;
import org.eclipse.jface.window.Window;
import org.eclipse.jface.wizard.WizardPage;
import org.eclipse.osgi.util.NLS;
import org.eclipse.swt.SWT;
import org.eclipse.swt.events.SelectionAdapter;
import org.eclipse.swt.events.SelectionEvent;
import org.eclipse.swt.graphics.Image;
import org.eclipse.swt.graphics.Point;
import org.eclipse.swt.layout.GridData;
import org.eclipse.swt.layout.GridLayout;
import org.eclipse.swt.widgets.Button;
import org.eclipse.swt.widgets.Composite;
import org.eclipse.swt.widgets.Event;
import org.eclipse.swt.widgets.Listener;
import org.eclipse.swt.widgets.Shell;
import org.eclipse.ui.ISharedImages;
import org.eclipse.ui.PlatformUI;
import org.eclipse.ui.ide.dialogs.UIResourceFilterDescription;
import org.eclipse.ui.ide.undo.CreateFolderOperation;
import org.eclipse.ui.ide.undo.WorkspaceUndoUtil;
import org.eclipse.ui.internal.ide.IDEWorkbenchMessages;
import org.eclipse.ui.internal.ide.IDEWorkbenchPlugin;
import org.eclipse.ui.internal.ide.IIDEHelpContextIds;
import org.eclipse.ui.internal.ide.dialogs.CreateLinkedResourceGroup;
import org.eclipse.ui.internal.ide.dialogs.ResourceFilterEditDialog;
import org.eclipse.ui.internal.ide.misc.OverlayIcon;
import org.eclipse.ui.internal.ide.misc.ResourceAndContainerGroup;
import org.eclipse.ui.plugin.AbstractUIPlugin;

/**
 * Standard main page for a wizard that creates a folder resource.
 * <p>
 * This page may be used by clients as-is; it may be also be subclassed to suit.
 * </p>
 * <p>
 * Subclasses may extend
 * <ul>
 * <li><code>handleEvent</code></li>
 * </ul>
 * </p>
 */
public class WizardNewFolderMainPage extends WizardPage implements Listener {
	private static final int SIZING_CONTAINER_GROUP_HEIGHT = 250;

	private IStructuredSelection currentSelection;

	private IFolder newFolder;

	// link target location
	private URI linkTargetPath;

	// widgets
	private ResourceAndContainerGroup resourceGroup;

	private Button advancedButton;
	private Button useDefaultLocation;
	private Button useVirtualFolder;
	private Button useLinkedResource;
	
	private Button filterButton;
	
	private CreateLinkedResourceGroup linkedResourceGroup;

	private Composite advancedComposite;
	
	private Composite linkedResourceComposite;
	private Composite linkedGroupComposite;

	private UIResourceFilterDescription[] filterList = null;
	
	/**
	 * Height of the "advanced" linked resource group. Set when the advanced
	 * group is first made visible.
	 */
	private int linkedResourceGroupHeight = -1;

	/**
	 * First time the advanced group is validated.
	 */
	private boolean firstLinkCheck = true;

	/**
	 * Creates a new folder creation wizard page. If the initial resource
	 * selection contains exactly one container resource then it will be used as
	 * the default container resource.
	 * 
	 * @param pageName
	 *            the name of the page
	 * @param selection
	 *            the current resource selection
	 */
	public WizardNewFolderMainPage(String pageName,
			IStructuredSelection selection) {
		super("newFolderPage1");//$NON-NLS-1$
		setTitle(pageName);
		setDescription(IDEWorkbenchMessages.WizardNewFolderMainPage_description);
		this.currentSelection = selection;
	}

	/**
	 * Creates the widget for advanced options.
	 * 
	 * @param parent
	 *            the parent composite
	 */
	protected void createAdvancedControls(Composite parent) {
		Preferences preferences = ResourcesPlugin.getPlugin()
				.getPluginPreferences();

		if (preferences.getBoolean(ResourcesPlugin.PREF_DISABLE_LINKING) == false) {
			advancedComposite = new Composite(parent, SWT.NONE);
			advancedComposite.setFont(parent.getFont());
			advancedComposite.setLayoutData(new GridData(
					GridData.FILL_HORIZONTAL));
			GridLayout layout = new GridLayout();
			layout.marginHeight = 0;
			layout.marginWidth = 0;
			advancedComposite.setLayout(layout);

			
			advancedButton = new Button(advancedComposite, SWT.PUSH);
			advancedButton.setFont(advancedComposite.getFont());
			advancedButton.setText(IDEWorkbenchMessages.showAdvanced);
			GridData data = setButtonLayoutData(advancedButton);
			data.horizontalAlignment = GridData.BEGINNING;
			advancedButton.setLayoutData(data);
			advancedButton.addSelectionListener(new SelectionAdapter() {
				public void widgetSelected(SelectionEvent e) {
					handleAdvancedButtonSelect();
				}
			});
		}
		linkedResourceGroup = new CreateLinkedResourceGroup(IResource.FOLDER,
				new Listener() {
					public void handleEvent(Event e) {
						setPageComplete(validatePage());
						firstLinkCheck = false;
					}
				}, new CreateLinkedResourceGroup.IStringValue() {
					public String getValue() {
						return resourceGroup.getResource();
					}

					public void setValue(String string) {
						resourceGroup.setResource(string);
					}
					public IResource getResource() {
						IPath path = resourceGroup.getContainerFullPath();
						if (path != null) {
							IWorkspaceRoot root = ResourcesPlugin.getWorkspace()
									.getRoot();
							IResource resource = root.findMember(path);
							if (resource != null && resource instanceof IContainer) {
								String resourceName = resourceGroup.getResource();
								if (resourceName.length() > 0) {
									try {
										return ((IContainer) resource).getFolder(Path
												.fromOSString(resourceName));
									} catch (IllegalArgumentException e) {
										// continue below.
									}
								}
								return resource;
							}
							return resource;
						}
						return null;
					}
				});
	}

	boolean setupLinkedResourceTargetRecursiveFlag = false;
	private void setupLinkedResourceTarget() {
		if (!setupLinkedResourceTargetRecursiveFlag) {
			setupLinkedResourceTargetRecursiveFlag = true;
			try {
				if (isFilteredByParent()) {
					URI existingLink = linkedResourceGroup.getLinkTargetURI();
					boolean setDefaultLinkValue = false;
					if (existingLink == null)
						setDefaultLinkValue = true;
					else {
						IPath path = URIUtil.toPath(existingLink);
						if (path != null)
							setDefaultLinkValue = path.toPortableString().length() > 0;
					}
					
					if (setDefaultLinkValue) {
						IPath containerPath = resourceGroup.getContainerFullPath();
						IPath newFilePath = containerPath.append(resourceGroup.getResource());
						IFolder newFolderHandle = createFolderHandle(newFilePath);
						try {
							URI uri= newFolderHandle.getPathVariableManager().convertToRelative(newFolderHandle.getLocationURI(), false, null);
							linkedResourceGroup.setLinkTarget(URIUtil.toPath(uri).toPortableString());
						} catch (CoreException e) {
							// nothing
						}
					}
				}
			}
			finally {
				setupLinkedResourceTargetRecursiveFlag = false;
			}
		}
	}

	/**
	 * (non-Javadoc) Method declared on IDialogPage.
	 */
	public void createControl(Composite parent) {
		initializeDialogUnits(parent);
		// top level group
		Composite composite = new Composite(parent, SWT.NONE);
		composite.setFont(parent.getFont());
		composite.setLayout(new GridLayout());
		composite.setLayoutData(new GridData(GridData.VERTICAL_ALIGN_FILL
				| GridData.HORIZONTAL_ALIGN_FILL));

		PlatformUI.getWorkbench().getHelpSystem().setHelp(composite,
				IIDEHelpContextIds.NEW_FOLDER_WIZARD_PAGE);

		resourceGroup = new ResourceAndContainerGroup(composite, this,
				IDEWorkbenchMessages.WizardNewFolderMainPage_folderName,
				IDEWorkbenchMessages.WizardNewFolderMainPage_folderLabel,
				false, SIZING_CONTAINER_GROUP_HEIGHT);
		resourceGroup.setAllowExistingResources(false);
		createAdvancedControls(composite);
		initializePage();
		validatePage();
		// Show description on opening
		setErrorMessage(null);
		setMessage(null);
		setControl(composite);
	}

	/**
	 * Creates a folder resource given the folder handle.
	 * 
	 * @param folderHandle
	 *            the folder handle to create a folder resource for
	 * @param monitor
	 *            the progress monitor to show visual progress with
	 * @exception CoreException
	 *                if the operation fails
	 * @exception OperationCanceledException
	 *                if the operation is canceled
	 * 
	 * @deprecated As of 3.3, use {@link #createNewFolder()} which uses the
	 *   undoable operation support.
	 */
	protected void createFolder(IFolder folderHandle, IProgressMonitor monitor)
			throws CoreException {
		try {
			// Create the folder resource in the workspace
			// Update: Recursive to create any folders which do not exist
			// already
			if (!folderHandle.exists()) {
				if (linkTargetPath != null) {
					folderHandle.createLink(linkTargetPath,
							IResource.ALLOW_MISSING_LOCAL, monitor);
				} else {
					IPath path = folderHandle.getFullPath();
					IWorkspaceRoot root = ResourcesPlugin.getWorkspace()
							.getRoot();
					int numSegments = path.segmentCount();
					if (numSegments > 2
							&& !root.getFolder(path.removeLastSegments(1))
									.exists()) {
						// If the direct parent of the path doesn't exist, try
						// to create the
						// necessary directories.
						for (int i = numSegments - 2; i > 0; i--) {
							IFolder folder = root.getFolder(path
									.removeLastSegments(i));
							if (!folder.exists()) {
								folder.create(false, true, monitor);
							}
						}
					}
					folderHandle.create(false, true, monitor);
				}
			}
		} catch (CoreException e) {
			// If the folder already existed locally, just refresh to get
			// contents
			if (e.getStatus().getCode() == IResourceStatus.PATH_OCCUPIED) {
				folderHandle.refreshLocal(IResource.DEPTH_INFINITE,
						new SubProgressMonitor(monitor, 500));
			} else {
				throw e;
			}
		}

		if (monitor.isCanceled()) {
			throw new OperationCanceledException();
		}
	}

	/**
	 * Creates a folder resource handle for the folder with the given workspace
	 * path. This method does not create the folder resource; this is the
	 * responsibility of <code>createFolder</code>.
	 * 
	 * @param folderPath
	 *            the path of the folder resource to create a handle for
	 * @return the new folder resource handle
	 * @see #createFolder
	 */
	protected IFolder createFolderHandle(IPath folderPath) {
		return IDEWorkbenchPlugin.getPluginWorkspace().getRoot().getFolder(
				folderPath);
	}

	/**
	 * Creates a container resource handle for the container with the given workspace path. This
	 * method does not create the resource.
	 * 
	 * @param containerPath the path of the container resource to create a handle for
	 * @return the new container resource handle
	 * @see #createFolder
	 * @since 3.6
	 */
	protected IContainer createContainerHandle(IPath containerPath) {
		if (containerPath.segmentCount() == 1)
			return IDEWorkbenchPlugin.getPluginWorkspace().getRoot().getProject(
					containerPath.segment(0));
		return IDEWorkbenchPlugin.getPluginWorkspace().getRoot().getFolder(
				containerPath);
	}

	/**
	 * Creates the link target path if a link target has been specified.
	 */
	protected void createLinkTarget() {
		linkTargetPath = linkedResourceGroup.getLinkTargetURI();
	}

	/**
	 * Creates a new folder resource in the selected container and with the
	 * selected name. Creates any missing resource containers along the path;
	 * does nothing if the container resources already exist.
	 * <p>
	 * In normal usage, this method is invoked after the user has pressed Finish
	 * on the wizard; the enablement of the Finish button implies that all
	 * controls on this page currently contain valid values.
	 * </p>
	 * <p>
	 * Note that this page caches the new folder once it has been successfully
	 * created; subsequent invocations of this method will answer the same
	 * folder resource without attempting to create it again.
	 * </p>
	 * <p>
	 * This method should be called within a workspace modify operation since it
	 * creates resources.
	 * </p>
	 * 
	 * @return the created folder resource, or <code>null</code> if the folder
	 *         was not created
	 */
	public IFolder createNewFolder() {
		if (newFolder != null) {
			return newFolder;
		}

		// create the new folder and cache it if successful
		final IPath containerPath = resourceGroup.getContainerFullPath();
		IPath newFolderPath = containerPath.append(resourceGroup.getResource());
		final IFolder newFolderHandle = createFolderHandle(newFolderPath);

		final boolean createVirtualFolder = useVirtualFolder != null && useVirtualFolder.getSelection();
		createLinkTarget();
		if (linkTargetPath != null) {
			URI resolvedPath = newFolderHandle.getPathVariableManager().resolveURI(linkTargetPath);
			try {
				IFileStore store = EFS.getStore(resolvedPath);
				if (!store.fetchInfo().exists()) {
					MessageDialog dlg = new MessageDialog(getContainer().getShell(),
							IDEWorkbenchMessages.WizardNewFolderCreationPage_createLinkLocationTitle,
							null, 
							NLS.bind(
									IDEWorkbenchMessages.WizardNewFolderCreationPage_createLinkLocationQuestion, linkTargetPath),
							MessageDialog.QUESTION_WITH_CANCEL,
							new String[] { IDialogConstants.YES_LABEL,
				                    IDialogConstants.NO_LABEL,
				                    IDialogConstants.CANCEL_LABEL },
							0);
					int result = dlg.open();
					if (result == Window.OK) {
						store.mkdir(0, new NullProgressMonitor());
					}
					if (result == 2)
						return null;
				}
			} catch (CoreException e) {
				MessageDialog
						.open(MessageDialog.ERROR,
								getContainer().getShell(),
								IDEWorkbenchMessages.WizardNewFileCreationPage_internalErrorTitle,
								NLS
										.bind(
												IDEWorkbenchMessages.WizardNewFileCreationPage_internalErrorMessage,
												e.getMessage()), SWT.SHEET);
	
				return null;
			} 
		}
		IRunnableWithProgress op = new IRunnableWithProgress() {
			public void run(IProgressMonitor monitor) {
				AbstractOperation op;
				op = new CreateFolderOperation(
					newFolderHandle, linkTargetPath, createVirtualFolder, filterList,
					IDEWorkbenchMessages.WizardNewFolderCreationPage_title);
				try {
					// see bug https://bugs.eclipse.org/bugs/show_bug.cgi?id=219901
					// directly execute the operation so that the undo state is
					// not preserved.  Making this undoable can result in accidental
					// folder (and file) deletions.
					op.execute(monitor, WorkspaceUndoUtil
						.getUIInfoAdapter(getShell()));
				} catch (final ExecutionException e) {
					getContainer().getShell().getDisplay().syncExec(
							new Runnable() {
								public void run() {
									if (e.getCause() instanceof CoreException) {
										ErrorDialog
												.openError(
														getContainer()
																.getShell(), // Was Utilities.getFocusShell()
														IDEWorkbenchMessages.WizardNewFolderCreationPage_errorTitle,
														null, // no special message
														((CoreException) e
																.getCause())
																.getStatus());
									} else {
										IDEWorkbenchPlugin
												.log(
														getClass(),
														"createNewFolder()", e.getCause()); //$NON-NLS-1$
										MessageDialog
												.openError(
														getContainer()
																.getShell(),
														IDEWorkbenchMessages.WizardNewFolderCreationPage_internalErrorTitle,
														NLS
																.bind(
																		IDEWorkbenchMessages.WizardNewFolder_internalError,
																		e
																				.getCause()
																				.getMessage()));
									}
								}
							});
				}
			}
		};

		try {
			getContainer().run(true, true, op);
		} catch (InterruptedException e) {
			return null;
		} catch (InvocationTargetException e) {
			// ExecutionExceptions are handled above, but unexpected runtime
			// exceptions and errors may still occur.
			IDEWorkbenchPlugin.log(getClass(),
					"createNewFolder()", e.getTargetException()); //$NON-NLS-1$
			MessageDialog
					.open(MessageDialog.ERROR,
							getContainer().getShell(),
							IDEWorkbenchMessages.WizardNewFolderCreationPage_internalErrorTitle,
							NLS
									.bind(
											IDEWorkbenchMessages.WizardNewFolder_internalError,
											e.getTargetException().getMessage()), SWT.SHEET);
			return null;
		}

		newFolder = newFolderHandle;

		return newFolder;
	}

	/**
	 * Shows/hides the advanced option widgets.
	 */
	protected void handleAdvancedButtonSelect() {
		Shell shell = getShell();
		Point shellSize = shell.getSize();
		Composite composite = (Composite) getControl();

		if (linkedResourceComposite != null) {
			linkedResourceComposite.dispose();
			linkedResourceComposite = null;
			filterButton.dispose();
			useDefaultLocation.dispose();
			useVirtualFolder.dispose();
			useLinkedResource.dispose();
			linkedGroupComposite.dispose();
			filterButton = null;
			useDefaultLocation = null;
			useVirtualFolder = null;
			useLinkedResource = null;
			linkedGroupComposite = null;
			composite.layout();
			shell.setSize(shellSize.x, shellSize.y - linkedResourceGroupHeight);
			advancedButton.setText(IDEWorkbenchMessages.showAdvanced);
		} else {
			Point oldCompositeSize = advancedComposite.computeSize(SWT.DEFAULT, SWT.DEFAULT);
			
			ImageDescriptor folderDescriptor = PlatformUI.getWorkbench().getSharedImages().getImageDescriptor(
	                ISharedImages.IMG_OBJ_FOLDER);

			ImageDescriptor[][] linkedResourceOverlayMap = new ImageDescriptor[4][1];
			linkedResourceOverlayMap[1]= new ImageDescriptor[] {AbstractUIPlugin.imageDescriptorFromPlugin(
					IDEWorkbenchPlugin.IDE_WORKBENCH,
			"$nl$/icons/full/ovr16/link_ovr.gif")}; //$NON-NLS-1$
			
			CompositeImageDescriptor linkedFolderDescriptor = new OverlayIcon(folderDescriptor, linkedResourceOverlayMap, new Point(16, 16)); 

			ImageDescriptor[][] virtualFolderOverlayMap = new ImageDescriptor[4][1];
			virtualFolderOverlayMap[1]= new ImageDescriptor[] {AbstractUIPlugin.imageDescriptorFromPlugin(
					IDEWorkbenchPlugin.IDE_WORKBENCH,
				"$nl$/icons/full/ovr16/virt_ovr.gif")}; //$NON-NLS-1$

			CompositeImageDescriptor virtualFolderDescriptor = new OverlayIcon(folderDescriptor, virtualFolderOverlayMap, new Point(16, 16)); 

			Image folderImage = folderDescriptor.createImage();
			useDefaultLocation = new Button(advancedComposite, SWT.RADIO);

			int indent = useDefaultLocation.computeSize(SWT.DEFAULT, SWT.DEFAULT).x;

			useDefaultLocation.setFont(advancedComposite.getFont());
			useDefaultLocation.setText(IDEWorkbenchMessages.useDefaultLocation);
			useDefaultLocation.setImage(folderImage);
			GridData data = setButtonLayoutData(useDefaultLocation);
			data.horizontalAlignment = GridData.BEGINNING;
			data.horizontalIndent = indent;
			useDefaultLocation.setLayoutData(data);

			Image virtualFolderImage = virtualFolderDescriptor.createImage();

			useVirtualFolder = new Button(advancedComposite, SWT.RADIO);
			useVirtualFolder.setFont(advancedComposite.getFont());
			useVirtualFolder.setImage(virtualFolderImage);
			useVirtualFolder.setText(IDEWorkbenchMessages.createVirtualFolder);
			data = setButtonLayoutData(useVirtualFolder);
			data.horizontalAlignment = GridData.BEGINNING;
			data.horizontalIndent = indent;
			useVirtualFolder.setLayoutData(data);

			Image linkedFolderImage = linkedFolderDescriptor.createImage();

			useLinkedResource = new Button(advancedComposite, SWT.RADIO);
			useLinkedResource.setFont(advancedComposite.getFont());
			useLinkedResource.setText(IDEWorkbenchMessages.createLinkedFolder);
			useLinkedResource.setImage(linkedFolderImage);
			data = setButtonLayoutData(useLinkedResource);
			data.horizontalAlignment = GridData.BEGINNING;
			data.horizontalIndent = indent;
			useLinkedResource.setLayoutData(data);

			SelectionAdapter radioListener = new SelectionAdapter() {
				public void widgetSelected(SelectionEvent e) {
					handleRadioSelect();
				}
			};
			
			useLinkedResource.addSelectionListener(radioListener);
			useVirtualFolder.addSelectionListener(radioListener);
			useDefaultLocation.addSelectionListener(radioListener);
			
			useDefaultLocation.setSelection(true);
			
			linkedGroupComposite = new Composite(advancedComposite, 0);
			data = new GridData(SWT.FILL, SWT.BEGINNING, true, false);
			data.horizontalIndent = indent;
			linkedGroupComposite.setFont(advancedComposite.getFont());
			linkedGroupComposite.setLayoutData(data);

			GridLayout layout = new GridLayout();
			layout.marginHeight = 0;
			layout.marginWidth = 0;
			linkedGroupComposite.setLayout(layout);

			linkedResourceComposite = linkedResourceGroup
					.createTextOnlyContents(linkedGroupComposite);
			if (linkedResourceGroupHeight == -1) {
				Point groupSize = linkedResourceComposite.computeSize(
						SWT.DEFAULT, SWT.DEFAULT, true);
				linkedResourceGroupHeight = groupSize.y;
			}
			linkedResourceGroup.setEnabled(false);

			filterButton = new Button(advancedComposite, SWT.PUSH);
			filterButton.setFont(advancedComposite.getFont());
			filterButton.setText(IDEWorkbenchMessages.editfilters);
			data = setButtonLayoutData(filterButton);
			data.horizontalAlignment = GridData.BEGINNING;
			data.horizontalIndent = indent;
			filterButton.setLayoutData(data);
			filterButton.addSelectionListener(new SelectionAdapter() {
				public void widgetSelected(SelectionEvent e) {
					handleEditFilterSelect();
				}
			});

			setupLinkedResourceTarget();
			advancedButton.setText(IDEWorkbenchMessages.hideAdvanced);

			Point newCompositeSize = advancedComposite.computeSize(SWT.DEFAULT, SWT.DEFAULT);
			linkedResourceGroupHeight = newCompositeSize.y - oldCompositeSize.y;
			getShell().setSize(shellSize.x, shellSize.y + linkedResourceGroupHeight);
			composite.layout(true);
		}
	}

	private void handleRadioSelect() {
		linkedResourceGroup.setEnabled(useLinkedResource.getSelection());
	}

	/**
	 * Show the Resource Filter dialog.
	 */
	private void handleEditFilterSelect() {
		ResourceFilterEditDialog dialog = new ResourceFilterEditDialog(getShell());
		dialog.setFilters(filterList);
		if (dialog.open() == Window.OK)
			filterList = dialog.getFilters();
	}
	
	/**
	 * The <code>WizardNewFolderCreationPage</code> implementation of this
	 * <code>Listener</code> method handles all events and enablements for
	 * controls on this page. Subclasses may extend.
	 */
	public void handleEvent(Event ev) {
		setPageComplete(validatePage());
	}

	/**
	 * Initializes this page's controls.
	 */
	protected void initializePage() {
		Iterator it = currentSelection.iterator();
		if (it.hasNext()) {
			Object next = it.next();
			IResource selectedResource = null;
			if (next instanceof IResource) {
				selectedResource = (IResource) next;
			} else if (next instanceof IAdaptable) {
				selectedResource = (IResource) ((IAdaptable) next)
						.getAdapter(IResource.class);
			}
			if (selectedResource != null) {
				if (selectedResource.getType() == IResource.FILE) {
					selectedResource = selectedResource.getParent();
				}
				if (selectedResource.isAccessible()) {
					resourceGroup.setContainerFullPath(selectedResource
							.getFullPath());
				}
			}
		}

		setPageComplete(false);
	}

	/*
	 * @see DialogPage.setVisible(boolean)
	 */
	public void setVisible(boolean visible) {
		super.setVisible(visible);
		if (visible) {
			resourceGroup.setFocus();
		}
	}

	/**
	 * Checks whether the linked resource target is valid. Sets the error
	 * message accordingly and returns the status.
	 * 
	 * @return IStatus validation result from the CreateLinkedResourceGroup
	 */
	protected IStatus validateLinkedResource() {
		IPath containerPath = resourceGroup.getContainerFullPath();
		IPath newFolderPath = containerPath.append(resourceGroup.getResource());
		IFolder newFolderHandle = createFolderHandle(newFolderPath);
		IStatus status = linkedResourceGroup
				.validateLinkLocation(newFolderHandle);

		if (status.getSeverity() == IStatus.ERROR) {
			if (firstLinkCheck) {
				setMessage(status.getMessage());
			} else {
				setErrorMessage(status.getMessage());
			}
		} else if (status.getSeverity() == IStatus.WARNING) {
			setMessage(status.getMessage(), WARNING);
			setErrorMessage(null);
		}
		return status;
	}

	/**
	 * Returns whether this page's controls currently all contain valid values.
	 * 
	 * @return <code>true</code> if all controls are valid, and
	 *         <code>false</code> if at least one is invalid
	 */
	protected boolean validatePage() {
		boolean valid = true;

		if (!resourceGroup.areAllValuesValid()) {
			// if blank name then fail silently
			if (resourceGroup.getProblemType() == ResourceAndContainerGroup.PROBLEM_RESOURCE_EMPTY
					|| resourceGroup.getProblemType() == ResourceAndContainerGroup.PROBLEM_CONTAINER_EMPTY) {
				setMessage(resourceGroup.getProblemMessage());
				setErrorMessage(null);
			} else {
				setErrorMessage(resourceGroup.getProblemMessage());
			}
			valid = false;
		}

		if ((useDefaultLocation == null) || useDefaultLocation.getSelection()) {
			IPath containerPath = resourceGroup.getContainerFullPath();
			if (containerPath != null &&
					createContainerHandle(containerPath).isVirtual()) {
				valid = false;
				setErrorMessage(IDEWorkbenchMessages.CreateLinkedResourceGroup_linkRequiredUnderAGroup);
			}
		}

		IStatus linkedResourceStatus = null;
		if (valid) {
			linkedResourceStatus = validateLinkedResource();
			if (linkedResourceStatus.getSeverity() == IStatus.ERROR) {
				valid = false;
			}
		}
		// validateLinkedResource sets messages itself
		if (valid
				&& (linkedResourceStatus == null || linkedResourceStatus.isOK())) {
			setMessage(null);
			setErrorMessage(null);
		}
		
		if (isFilteredByParent()) {
			setMessage(IDEWorkbenchMessages.WizardNewFolderCreationPage_resourceWillBeFilteredWarning, IMessageProvider.ERROR);
			setupLinkedResourceTarget();
			valid = false;
		}
		
		return valid;
	}
	
	private boolean isFilteredByParent() {
		boolean createVirtualFolder = useVirtualFolder != null && useVirtualFolder.getSelection();
		if (createVirtualFolder)
			return false;
		if ((linkedResourceGroup == null) || linkedResourceGroup.isEnabled())
			return false;
		IPath containerPath = resourceGroup.getContainerFullPath();
		if (containerPath == null)
			return false;
		String resourceName = resourceGroup.getResource();
		if (resourceName == null)
			return false;
		if (resourceName.length() > 0) {
			IPath newFolderPath = containerPath.append(resourceName);
			if (newFolderPath.segmentCount() < 2)
				return false;
			IFolder newFolderHandle = createFolderHandle(newFolderPath);
			IWorkspace workspace = newFolderHandle.getWorkspace();
			return !workspace.validateFiltered(newFolderHandle).isOK();
		}
		return false;
	}
}
